Jamb Chemistry 1992 Past Questions and Answers

Question 26:

• JAMB 1992

In what way is equilibrium constant for the forward reaction related to that of the reversed reaction?

A. The additional of the two is expected to be one
B. The product of the two is expected to be one
C. The two equilibrium constants are identical
D. The product of the two is always greater than one

Question 27:

• JAMB 1992

Which of the following equilibria shows little or no net reaction when the volume of the system is decreased?

A. H_2(g) + I_2(g) ≈ 2HI_(g)
B. 2NO₂^(g) ≈ N₂O_4(g)O_4(g)N₂O_4(g)
C. PCI_5(g) ≈ PCI_3(g) + CI_2(g)
D. ZnO_(s) + CO_2(g) ≈ ZnCO_3(g)

Question 28:

• JAMB 1992

For a general equation of the nature xP + yQ ≈ mR + nS, the expression for the equilibrium constant is?

A. K (p)^x (Q)^y
B. (p)^x (Q)^y / (R)^m (S)ⁿ
C. (R)^m (S)ⁿ / (p)^x (Q)^y
D. M(R) n (S) / x(P) y (Q)

Question 29:

• JAMB 1992

Which of these statements is TRUE about carbon (IV) oxide?

A. It supports combustion
B. It is strongly acidic in water
C. It is very soluble in water
D. It supports the buring of magnesium to produce magnesium oxide

Question 30:

• JAMB 1992

Which of the following combination of gases is used for metal welding? i. Oxygen and ethyne, ii. Hydrogen and ethyne, iii. Hydrogen and oxygen, iv. Ethyne, hydrogen and oxygen.

A. I and ii
B. Ii and iv
C. I and iii
D. Ii and iv